Claude Code mod

harness-runtime

Shared Claude runtime adapter: normalises function-hook events into ClaudeRuntimeEvent, exposes $.runtime (emit bus, supports, judge, snapshot) to other plugins, and writes a JSONL event log

24 starsContext & usage mods Plugin marketplaceValidates on Claude Code 2.1.319 Source

Install

Inside Claude Code

/plugin marketplace add ucsandman/Agnostic-AI
/plugin install harness-runtime@harness-mods

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach: L3Network: network, writes files, drives Claude, reads files, reads env vars, reads settings, persists state, other: $.runtime.emit
Sees: every prompt, every tool call, subagent spawns
Hooks: engine.createruntime.judgesession.startprompt.submitturn.startturn.steptool.checktool.callagent.spawnturn.complete

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.

Claude Code docs

Details

Repository: ucsandman/Agnostic-AI
Folder: engine/mods/harness-runtime
Marketplace: harness-mods
Author: Wes Sander
Type: Context & usage mods
License: MIT
Last updated: 9 November 2026
Listed in: awesome-claude-code-mods

FAQ

What is harness-runtime?

Shared Claude runtime adapter: normalises function-hook events into ClaudeRuntimeEvent, exposes $.runtime (emit bus, supports, judge, snapshot) to other plugins, and writes a JSONL event log It is a mod for Claude Code, from ucsandman/Agnostic-AI on GitHub.

What can the harness-runtime mod access?

Its widest reach is "network" (network, writes files, drives Claude, reads files, reads env vars, reads settings, persists state, other: $.runtime.emit). It sees every prompt, every tool call, subagent spawns. Like any mod, it runs with your permissions.

How do I install harness-runtime?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add ucsandman/Agnostic-AI and then /plugin install harness-runtime@harness-mods.

Is harness-runtime popular?

ucsandman/Agnostic-AI has 24 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 9 November 2026.

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